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Oracle Linux 6 Advanced System Administration

Question No: 31

What is function of the System Security Service Daemon (SSSD)?

  1. It permits single-user accounts by maintaining credentials for back-end systems on behalf of local users.

  2. It enables fingerprint reader support for Kerberos clients.

  3. It enables Smart Card Authentication for Kerberos clients.

  4. It permits Kerberos authentication to be done offline by caching user identities.

Answer: A

Question No: 32

Which two statements are true aboutOCFS2?

  1. It always requires TCP network connectivity.

  2. It never requires TCP network connectivity.

  3. It requires a dedicated private network.

  4. It requires TCP network connectivity for the cluster.

  5. It requires an installation of theocfs2-toolsRPM package.

Answer: A,C

Question No: 33

Examine the udevadm command:

udevadm info -attribute-walk -name =/dev/sdb Which two statements are true about this command/

  1. It displays the device tree, and all attributes maintained indevfsfor all parent devices in the device tree for the/dev/sdbdisk device.

  2. The attributes listed by this command can be used inudevdevice naming rules.

  3. It displays the device naming rules that were used to name the device as/dev/sdb.

  4. It displays the device tree, and all attributes maintained insysfsfor all parent devices in the device tree for the/dev/sdbdisk device.

  5. It displays all attributes maintained insysfsfor the/dev/sdbkernel device, excluding parent devices.

  6. It displays all attributes maintained indevfsfor the/dev/sdbkernel device, excluding parent devices.

Answer: C,D

Question No: 34

Which two statements are true about debuggingOCFS2?

  1. Theo2imagecommand copiesOCFS2file system data from the device to the specified image file.

  2. Theo2imagecommand copiesOCFS2file system metadata from the device to the specified image file.

  3. You must mount thedebugfsfile system to enablethe use of thedebugfs.ocfs2command.

  4. Trace bits has two possible statuses: allow and deny.

  5. You must unmount allocfs2file systems to enable the use of thedebugfs.ocfs2command.

Answer: B,C Explanation:

o2image copies the OCFS2 file system meta-data from the device to the specified image- file. This image file contains the file system skeleton that includes the inodes, directory names and file names. It does not include any file data.

This image file can be useful to debug certain problems that are not reproducible otherwise. Like on-disk corruptions. It could also be used to analyse the file system layout in an aging file system with an eye towards improving performance.

As the image-file contains a copy of all the meta-data blocks, it can be a large file. By default, it is created in a packed format, in which all meta-data blocks are written back-to- back. With the -r option, the user could choose to have the file in the raw (or sparse) format, in which the blocks are written to the same offset as they are on the device.

debugfs.ocfs2 understands both formats.

Question No: 35

Examine the code fragmentfrom /etc/tgt/targets.conf:

lt;target iqn.2013-03.com.example.mypc:1gt; backing-store /iSCSIsharedDisk/physDisk1.img write-cache off

lt;/targetgt;

lt;target iqn.2013-03.com.example.myps:2gt; backing-store / iSCSIsharedDisk/physDisk2.img initiator-address 192.0.2.105

initiator address 192.0.2.106 write-cache off

lt;/targetgt;

lt;target iqn.2013-03.com.example.mypc:3gt; backing-store /iSCSIsharedDisk/physDisk3.img write-cache off

lt;/targetgt;

Which statement is true?

  1. Only the target identified by theiqnending withmypc:2is visible. This target is visible to the specific clients identified by the initiator address.

  2. Theinitiator-addresssyntax in not valid. The address value should be specified as aniqn, not an IP address. This causes an error, and onlyiqns ending withmypc:1andmypc:3are visible.

  3. All targets are visible to prospective clients, but the targetiqnending withmypc:2is visible exclusively to the specified IP addresses.

  4. Theinitiator-addresssyntax is not valid. The address value must be specified as aniqn, not an IP address. Theinitiator-addressparameters are ignored and all targets are visible withoutrestriction.

Answer: B

Question No: 36

Examine this command and its output:

# yum history list Loaded plugins: security ID

Login user Data and time Action(s) Altered

3

lt;oraclegt;

2014-07-2913:34

Install 3

2

lt;oraclegt;

2014-07-2913:33

Install 7

1

lt;oraclegt;

2014-07-2913:33

Install 1

history list

Which command must you use to undo the last two yum transactions?

  1. # yum history rollback 2

  2. # yum history rollback 3

  3. # yum history undo last-1

  4. # yum history undo last-3

Answer: A

Question No: 37

Which statement is true aboutbtrfsfile system devices?

  1. You must execute thebtrfsdevice scan after every reboot to add a device to abtrfsfile system.

  2. Thebtrfs device scan -all-devicescommand scans physical devices looking for members

    of a btrfs volume.

  3. Blocks are automatically rebalanced across all existing devices after adding new devices.

  4. A device may be added tobtrfsonly if the file system is unmounted.

Answer: B

Question No: 38

Examine thedtracecommand.

dtrace -n ‘proc:::exec {trace(execname);trace(pid);trace(stringof(arg0));}’ Which two statements are true?

  1. Thetrace(execname)action causes the called program name to be printed.

  2. Thetrace(pid)action causes the calling program’s process to be printed

  3. Thetrace(stringof(arg0))action causes the called program’s first argument to be printed.

  4. The probe name isexec.

  5. The probe function is not specified.

    Answer: C,E

    Reference:http://docs.oracle.com/cd/E19253-01/819-5488/gbxwv/index.html

    Question No: 39

    You have an unmountedbtrfsfile system:

    # btrfs filesystem show

    Label: ‘Btrfs’ uuid: 7bfe3239-47ee-442b-b9f8-49f88b6b1be4 Total devices 3 FS bytes used 300.51MB

    devid2 size 4.88GB used 1.06GB path /dev/sdd devid1 size 4.88GB used 580.00GB path /dev/sdc devid3 size 4.88GB used 1.50GB path /dev/sdb

    You have these mounted devices:

    # df -h Filesystem Size

    Used Avail Use%

    Mounted on

    /dev/mapper/vg_exam1-LogVol_system

    9.6G

    3.3G

    3.9G

    46%

    / tmpfs 499M

    0

    499M

    0%

    /dev/shm

    /dev/sda1 485M

    77M

    384M

    17%

    /boot

    You have a mount point for thebtrfsfile system:

    # ls -all /btrfs total 0

    drwxr-xr-x. 1 root root 0 Aug 12 10:17 .

    dr-xr-xr-x. 1 root root 276 Aug 12 10:36 .. Examine these steps:

    1. Manual defragment is not needed. Btrfs will defragment it automatically.

    2. btrfs device defragment /dev/sdd

    3. btrfs filesystem defragment /btrfs

    4. btrfs device delete /dev/sdb /btrfs

    5. mount UUID=7bfe3239-47ee-442b-b9f8-49f88b6b1be4 /btrfs

    6. btrfs device delete /dev/sdb /dev/sdd

      What is the correctorder to delete the/dev/sdbdevice from thebtrfsfile system and for defragmenting the reduced file system?

      A. 6, 1

      B. 5, 4, 3

      C. 5, 6, 4, 3

      D. 5, 6, 1

      E. 4, 2

      Answer: B

      Question No: 40

      Which statement is true aboutudev?

      1. It is static kernel device naming scheme based ondevfs.

      2. It prevents device renaming upon reboot by default.

      3. Theudevconfiguration file is/etc/udev.conf.

      4. It is a dynamic kernel device naming scheme based onsysfs.

Answer: C Explanation:

udev expects its main configuration fileat /etc/udev/udev.conf. Thefile consists of a set of variablesand values allowing the user tooverride default udev values.

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